# Threatening Letter

An episode of [Unit](https://invisiblenetwork.ai/radio-drama/series/unit), aired 25 October 1957, 25 min. Audio: https://archive.org/download/8521c013-7c74-4b68-a7cc-8354c80d71da/3b7ffd159cdff66ce938c86b557e2f3f1337e984cf3242fb9aa6b1fa96185c72.mp3

From Unit 99 1957-10-25 Threatening Letter (Old Time Radio). the Internet Archive states no licence or rights for it. Source: https://archive.org/details/8521c013-7c74-4b68-a7cc-8354c80d71da

Nothing here is called public domain on this site's say-so. In the United States, sound recordings first fixed before 15 February 1972 have federal protection under the Music Modernization Act of 2018, for most until 2067 at the latest, so most American radio of the 1930s to the 1950s is not in the public domain there. Each set shows the licence, mark or statement its archive gives, and says whose it is. An episode whose only basis is its uploader's public-domain mark is not played, as that law protects it; one under its rights holder's licence plays everywhere.
